Year 2014, Volume 38 , Issue 2, Pages 266 - 277 2014-02-01

Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend
Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend

MOHAMMAD VAGHEFI [1] , MOHAMMAD SHAKERDARGAH [2] , MARYAM AKBARI [3]


A spur dike is a structure that projects from a stream bank into the river channel and causes a redirection of flow away from the bank toward the tip of the spur dike. Construction of a spur dike against the flow causes significant changes in flow pattern in the channel. In this study, the flow pattern around a 25% submerged T-shaped spur dike in a 90$^{\circ}$ bend with rigid bed and various Froude numbers 0.2, 0.34, 0.45, and 0.6 was examined using FLOW-3D software. Numerical results were compared with experimental results and analyzed. The results indicated that in cross section around the spur dike, when Froude number increases, the formed vortexes decreased by 35%. Longitudinal velocity and lateral velocity increased twice as much as their former values. The highest amount of vertical velocity was observed between the wing of the spur dike and the external bend, and closer to the external bend, with an increase in Froude number, vertical velocity components variations decreased by 33%. Moreover, the results indicated that when the Froude number increases, the width of the separation zone increases, but the change in the length of the separation zone in different levels is negligible.
A spur dike is a structure that projects from a stream bank into the river channel and causes a redirection of flow away from the bank toward the tip of the spur dike. Construction of a spur dike against the flow causes significant changes in flow pattern in the channel. In this study, the flow pattern around a 25% submerged T-shaped spur dike in a 90$^{\circ}$ bend with rigid bed and various Froude numbers 0.2, 0.34, 0.45, and 0.6 was examined using FLOW-3D software. Numerical results were compared with experimental results and analyzed. The results indicated that in cross section around the spur dike, when Froude number increases, the formed vortexes decreased by 35%. Longitudinal velocity and lateral velocity increased twice as much as their former values. The highest amount of vertical velocity was observed between the wing of the spur dike and the external bend, and closer to the external bend, with an increase in Froude number, vertical velocity components variations decreased by 33%. Moreover, the results indicated that when the Froude number increases, the width of the separation zone increases, but the change in the length of the separation zone in different levels is negligible.
  • Ahmad M. Spacing and protection of spurs for bank protection. Civil Engineering and Publication Review 1951; 46: 3–7.
  • Ahmad M. Experiments on design and behavior of spur dikes. Proc. Int. Hyd. Convention, New York, NY, USA: ASCE; 1953. pp. 145–159.
  • Gill MA. Erosion of sand beds around spur dikes. J Hydr Div 1972; 98: 91–98.
  • Rajaratnam N, Nwachukwu BA. Flow near groin-like structures. J Hydraul Eng-ASCE 1983; 109: 463–480.
  • Rajaratnam N, Nwachukwu BA. Erosion near groin-like structures. J Hydraul Res 1983; 21: 277–287.
  • Soliman MM, Attia KM, Kotb Talaat AM, Ahmed AF. Spur dike effects on the river Nile morphology after high Aswan dam. Congress of the International Association of Hydraulic Research, Vol. 120, San Francisco, CA, USA: IAHR; 1997. pp. 125–146.
  • Blanckaert K, Graf WH. Mean flow and turbulence in open-channel bend. J Hydraul Eng-ASCE 2001; 127: 835–847.
  • Booij R. Measurements and large eddy simulations of some curved flumes. J Turbul 2003; 4: 1297–1313.
  • Giri S, Shimizu Y, Surajate B. Laboratory measurement and numerical simulation of flow and turbulence in a meandering-like flume with spurs. Flow Meas Instrum 2004; 15: 301–309.
  • Nagata N, Hosoda T, Nakato T, Muramoto Y. Three-dimensional numerical model for flow and bed deformation around river hydraulic structures. J Hydraul Eng-ASCE 2005; 131: 1074–1087.
  • Fazli M, Ghodsian M, Saleh Neyshabouri, AA. Scour and flow field around a spur dike in a 90 ◦ bend. Int J Sediment Res 2008; 23: 56–68.
  • Ghodsian M, Vaghefi M. Experimental study on scour and flow field in a scour hole around a T-shaped spur dike in a 90 ◦ bend. Int J Sediment Res 2009; 24: 145–158.
  • Duan J. Mean flow and turbulence around a laboratory spur dike. J Hydraul Eng-ASCE 2009; 135: 803–811.
  • Yazdi J, Sarkardeh H, Azamathulla HM, Ghani AA. 3D simulation of flow around a single spur dike with free-surface flow. International Journal of River Basin Management 2009; 8: 55–62.
  • Vaghefi M, Ghodsian M, Salehi Neyshabori SAA. Experimental study on the effect of a T-shaped spur dike length on scour in a 90 degree channel bend. Arab J Sci Eng 2009; 34: 337–348.
  • Vaghefi M, Ghodsian M, Salehi Neyshabori SAA. Experimental study on scour around a T-shaped spur dike in a channel bend. J Hydraul Eng-ASCE 2012; 138: 471–474.
  • Vaghefi M, Ghodsian M, Adib A. Experimental study on the effect of Froude number on temporal variation of scour around a T-shaped spur dike in a 90 degree bend. Appl Mech Mater 2012; 147: 75–79.
  • Acharya A, Acharya A, Duan J. Three dimensional simulation of flow field around series of spur dikes. International Refereed Journal of Engineering and Science (IRJES) 2013; 2: 36–57.
  • Flow Science. FLOW-3D User’s Manual. 9.3 editions, USA: Flow Science, Inc. 2008.
Primary Language tr
Journal Section Articles
Authors

Author: MOHAMMAD VAGHEFI

Author: MOHAMMAD SHAKERDARGAH

Author: MARYAM AKBARI

Dates

Publication Date : February 1, 2014

Bibtex @ { tbtkengineering145616, journal = {Turkish Journal of Engineering and Environmental Sciences}, issn = {1300-0160}, eissn = {1303-6157}, address = {}, publisher = {TUBITAK}, year = {2014}, volume = {38}, pages = {266 - 277}, doi = {10.3906/muh-1405-2}, title = {Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90\$\^\{\\circ\}\$ bend}, key = {cite}, author = {VAGHEFI, MOHAMMAD and SHAKERDARGAH, MOHAMMAD and AKBARI, MARYAM} }
APA VAGHEFI, M , SHAKERDARGAH, M , AKBARI, M . (2014). Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend. Turkish Journal of Engineering and Environmental Sciences , 38 (2) , 266-277 . DOI: 10.3906/muh-1405-2
MLA VAGHEFI, M , SHAKERDARGAH, M , AKBARI, M . "Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend". Turkish Journal of Engineering and Environmental Sciences 38 (2014 ): 266-277 <https://dergipark.org.tr/en/pub/tbtkengineering/issue/12203/145616>
Chicago VAGHEFI, M , SHAKERDARGAH, M , AKBARI, M . "Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend". Turkish Journal of Engineering and Environmental Sciences 38 (2014 ): 266-277
RIS TY - JOUR T1 - Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend AU - MOHAMMAD VAGHEFI , MOHAMMAD SHAKERDARGAH , MARYAM AKBARI Y1 - 2014 PY - 2014 N1 - doi: 10.3906/muh-1405-2 DO - 10.3906/muh-1405-2 T2 - Turkish Journal of Engineering and Environmental Sciences JF - Journal JO - JOR SP - 266 EP - 277 VL - 38 IS - 2 SN - 1300-0160-1303-6157 M3 - doi: 10.3906/muh-1405-2 UR - https://doi.org/10.3906/muh-1405-2 Y2 - 2020 ER -
EndNote %0 Turkish Journal of Engineering and Environmental Sciences Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend %A MOHAMMAD VAGHEFI , MOHAMMAD SHAKERDARGAH , MARYAM AKBARI %T Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend %D 2014 %J Turkish Journal of Engineering and Environmental Sciences %P 1300-0160-1303-6157 %V 38 %N 2 %R doi: 10.3906/muh-1405-2 %U 10.3906/muh-1405-2
ISNAD VAGHEFI, MOHAMMAD , SHAKERDARGAH, MOHAMMAD , AKBARI, MARYAM . "Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend". Turkish Journal of Engineering and Environmental Sciences 38 / 2 (February 2014): 266-277 . https://doi.org/10.3906/muh-1405-2
AMA VAGHEFI M , SHAKERDARGAH M , AKBARI M . Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend. Turkish Journal of Engineering and Environmental Sciences. 2014; 38(2): 266-277.
Vancouver VAGHEFI M , SHAKERDARGAH M , AKBARI M . Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{\circ}$ bend. Turkish Journal of Engineering and Environmental Sciences. 2014; 38(2): 277-266.

Authors of the Article
MOHAMMAD VAGHEFI [1]
MOHAMMAD SHAKERDARGAH [2]
MARYAM AKBARI [3]